Air ticket ****

I bought a ticket with Singapore Airlines to ****et. After Thailand closed its borders to South Africa, I had to cancel my ticket. I took out insurance for this eventuality, and am supposed to get a voucher to the value of 90% of the ticket. I received an email from an outfit called Mytrip confirming that the voucher will be issued within 7 days, on 24 October. Despite repeated attempts to contact them, I had no success. Still no voucher.